ABB TF42-13 Thermal Overload Relay, 9-13 A, 3-Pole, Class 10, 690 V AC, 1NO+1NC

In motor control panels across industrial plants, the ABB TF42-13 thermal overload relay protects three-phase motors from overheating due to overload or phase failure. Set the rotary dial between 9 and 13 A to match full-load current, and the relay trips within 10 seconds at 7.2 times the set current. Install it directly onto ABB AF09...AF38 contactors or as a standalone unit with an adapter. Maintenance teams value the manual/automatic reset and the test function for quick commissioning checks.

Key specifications

• Rated operational current range: 9.0 – 13.0 A
• Tripping class: Class 10
• Number of poles: 3
• Rated operational voltage: 690 V AC
• Rated insulation voltage: 690 V
• Rated impulse withstand voltage: 6 kV
• Auxiliary contacts: 1 NO + 1 NC
• Mounting: direct to contactor or standalone with adapter
• Reset: manual and automatic
• Ambient operating temperature: -25 to +60 °C
• Degree of protection: IP20
• Standards: IEC/EN 60947-4-1, UL 60947-4-1, CSA 60947-4-1
• Connection type: screw terminals
• Compatible contactors: ABB AF09, AF12, AF16, AF26, AF30, AF38
• Power loss per pole: 1.6 W at max current
• Phase failure sensitivity: yes
• Adjustment: rotary knob with scale
• Test function: yes

Why choose it

The TF42-13 combines precise thermal protection with robust construction for demanding industrial environments. Its phase failure sensitivity prevents motor burnout from single-phasing, while the wide adjustment range covers common motor sizes. Direct mounting on ABB contactors saves panel space and simplifies wiring. Compliance with international standards ensures reliable performance worldwide.

Ideal use cases

• Protecting three-phase motors in conveyor systems, pumps, fans, and compressors
• Retrofitting existing ABB contactor installations with thermal overload protection
• Standalone protection for motors up to 13 A when used with an adapter
• Applications requiring manual or automatic reset options

Good to know

The relay features screw terminals for secure connections and a rotary knob for precise current setting. The test function simulates a trip to verify the protection circuit. For standalone mounting, use a suitable adapter (not included). The IP20 protection rating means it should be installed in an enclosure. Always disconnect power before installation or maintenance.